Fuel Filter Partitioning Water Separation Without Seals
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Solution Overview
Problem
Existing diesel fuel filters face challenges in efficiently separating water from filtered fuel without using additional seals, which complicates manufacturing and can affect the seal's integrity due to direct contact with diesel fuel.
Innovation Solution
A water-separating fuel filter design featuring a hydrophobic cloth or fabric on the filter element's inner face, with a partitioning mechanism that separates the water accumulation compartment from the dirty fuel zone, eliminating the need for additional seals and enhancing structural rigidity by forming a double bottom with the casing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a seal is added to the lower flange to separate clean fuel zone from dirty fuel zone, then water separation efficiency is improved, but device complexity increases and manufacturing becomes more difficult
Solution Approach 1:
The interior volume is divided into a lower compartment for water collection and an upper compartment for filtration. The partition with a central conduit creates distinct zones that separate water accumulation from the filtration path, eliminating the need for additional seals while maintaining water separation efficiency.
Solution Approach 2:
The partition acts as an intermediary structure that mediates between the dirty fuel zone and clean fuel zone. It provides a controlled interface through the central conduit that allows water to be separated and collected without requiring direct sealing between the two zones.
2Reliability
If an annular seal is inserted between the housing and filter element, then sealing between zones is achieved, but fitting becomes delicate and the seal is affected by direct contact with diesel fuel
Solution Approach 1:
The sealing function is extracted from the filter element assembly and transferred to the partition structure that is integral with the housing. This eliminates the need for separate seals on the filter element, simplifying both manufacturing and assembly while improving sealing reliability.
Solution Approach 2:
The partition is merged with the housing as an integral structure, combining the housing and sealing functions into a single component. This eliminates the interface between separate parts that would require sealing, thereby eliminating the need for additional seals and their associated manufacturing complexities.
3Volume of moving object
If the filter element is positioned close to the bottom for compact design, then filter size is reduced, but water collection space is insufficient
Solution Approach 1:
The partition extends vertically from the bottom of the housing upward, creating a three-dimensional water collection compartment. This vertical dimension allows sufficient water collection space while maintaining a compact overall filter size, as the water collection function is achieved through height rather than radial expansion.
4Volume of moving object
If the casing walls are made thinner to reduce filter size, then compactness is improved, but structural rigidity decreases and deformation under pressure increases
Solution Approach 1:
The partition divides the interior volume into separate compartments, creating internal structural support that reinforces the casing. This segmentation provides rigidity to the structure, allowing the use of thinner wall materials while maintaining sufficient structural strength to resist pressure pulsations.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This design effectively separates water from filtered fuel without additional seals, reduces manufacturing complexity, and enhances the filter's structural integrity by minimizing deformation under pressure pulsations, allowing for a more compact size and easier installation.
Implementation Method 1
a water separation member such as a hydrophobic cloth is provided on the inner face side or on an inner tube of the filter element and for separating water in the interior space
Implementation Method 2
the partition comprising a central conduit for communication between the interior space and the lower compartment
Data Source
Figure 1
Figure 2
Figure 3
AI summary
The filter (1) has a filter element (6) placed in an upper compartment (V1) of a housing (2), and a filter medium (7) extending about an axis (A) and defining an interior space (9) in communication with an outlet (4b) of the housing. A support (S) for fixing the filter element includes a partition (50) fixed to the housing. The partition includes a central duct (14) for communication between the interior space interior and a lower compartment (V2) of the housing, where a lower end of the filter element is sealingly connected to the support by radial annular contact with the central duct.